Fastener



FIG. 1 is an isometric view, showing my new design;

FIG. 2 is a side view of the design of FIG. 1;

FIG. 3 is a top view of the design of FIG. 1;

FIG. 4 is another side view of the design of FIG. 1;

FIG. 5 is a bottom view of the design of FIG. 1;

FIG. 6 is a front view of the design of FIG. 1; and,

FIG. 7 is a rear view of the design of FIG. 1. 

I claim the ornamental design for a fastener, as shown and described. 